ci: make workflow to verify samples, list all subdirs #632

Job	Run time
Java tests (swift:6.1.2 jdk:Corretto os:jammy)	1m 40s
Swift tests (swift:6.1.2 jdk:Corretto os:jammy)	1m 40s
verify-samples / construct-samples-matrix	2s
soundness / Unacceptable language check	4s
soundness / Documentation check	40s
soundness / API breakage check	0s
soundness / YAML lint check	6s
soundness / License headers check	7s
soundness / Broken symlinks check	3s
soundness / Shell check	38s
soundness / Python lint check	7s
soundness / Format check	0s
verify-samples / matrix.config.name	0s
	5m 7s

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